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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d89a8e90dd8c30a9a306ecf7dd2857fe43ae1d07ae0afbe62046fde35c4210' 
  AND token = 'CI2NqSLhue8ebn6MY/A8cQjbf2DRXmjWYeRk6xdkOjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}